Cone for loud-speaker assembly



Dec. 30, 1958 R. C. HUNTER CONE FOR LOUD-SPEAKER ASSEMBLY Filed Nov. 28,1955 I N V EN TOR. A 055? r C HUNTER United States Patent CONE FORLOUD-SPEAKER ASSEMBLY Robert C. Hunter, Pepper Pike, Ohio ApplicationNovember 28, 1955, Serial No. 549,358

2 Claims. (Cl. 181-232) that has its outer marginal portion so formed asto permit more effective seating engagement thereof upon and within thecorresponding portion of the basket of a loudspeaker assembly.

Other objects will appear from the following description and claims whenconsidered together with the accompanying drawing.

Fig. 1 is a sectional view illustrating my present improved cone in aloud-speaker assembly.

Fig. 2 is an enlarged view of a portion thereof.

It is to be understood that the present disclosure is merely for thepurpose of illustration and that there might be devised variousmodifications thereof without departing from the spirit of my inventionas herein set forth and claimed.

In order to illustrate my present invention, I have indicated aconventional loud-speaker except for the particular form of my presentimproved cone and its assembly within the basket of such organization.For instance, there is the familiar magnet 1 which may be either apermanent magnet or an electromagnet and which is provided with a core2; and there is a pole piece 3 with a central opening to receive thecore 2. The cone 4 is mounted within the basket 5 which may be suitablysecured to the pole piece 3. As will be understood, the voice coil maybe mounted about an axial neck provided upon the cone so as to bedisposed concentrically within the gap between the core 2 and the polepiece 3.

It has been common practice to provide annular ribs 6 in the outer partof the cone 4, such ribs being of comparatively shallow depth. Now, Ihave provided the annular shoulder or cup 7 outside of the regular ribs6, this shoulder being of greater depth than the ribs 6 and having anouter marginal substantially flat annular portion 8 for uniformlyeffective seating engagement upon the annular flat part 5a of the basket5 and within the angular annular edge portion 9 thereof. That is to say,the shoulder or cup 7 may extend approximately parallel to theiongitudinal axis of the basket 5 although it is preferably slightlyinclined inwardly and forwardly for the sake of flexibility in thisregion of the cone 4; and the extreme edge portion 8 extends in a planethat is normal to the longitudinal axis of the basket.

The basket 5 may be made of metal and the cone 4 may be made of lightflexible fibrous material; and, in order to secure the cone in position,a conventional fibrous ring 10 may be cemented within the flange 9 andupon the marginal portion 8 of the cone. Suitable clearance is providedbetween the shoulder or cup 7 and the ring 10 so as to ensure properfunctioning of the cone 4 in the region of the shoulder or cup 7 in themanner in tended.

It is to be noted that the shoulder or cup 7 affords a substantialincrease in the surface area of the cone within the inner margin of itsouter clamping engagement and, as a result, there is obtained acorresponding increase in the responsiveness or sensitivity of the same.Also, it is believed that this increased flexibility will make possiblethe reproduction of sounds in a lower register than would otherwise bepossible.

By making the shoulder or cup 7 deeper than the ribs 6, the supportingengagement of the flange 8 will be in a plane rearwardly of the crestsof the ribs 6 and consequently the ribs 6 and the shoulder or cup 7 willhave marked freedom of movement which also contributes to thesensitivity of the same and which would not be possible if the ribs 6were in actual contactual engagement with the portion 5a of the basket5.

Also, the engagement of the annular edge of the flat marginal portion 8upon the portion 5a and within the flange 9 will serve as a means ofseating and centering the cone 4 in truly proper and uniform positionwithin the basket.

Thus I have devised a cone that possesses marked practical advantagesand that can be manufactured in a simple and inexpensive manner; and itis believed that other advantages, resulting from this invention, maysuggest themselves to those who are familiar with the art to which itrelates.

What I claim is:

1. In combination, a loud-speaker basket with an outer marginal annularflat portion approximately normal to the longitudinal axis of saidbasket and with an adjoining outer edge portion that extendsapproximately parallel to the longitudinal axis of said basket, and acone-shaped body of flexible material formed with a plurality of annularconcentric ribs near the outer margin thereof, the marginal portion ofsaid cone-shaped body, beyond said ribs, being formed with an annularshoulder that extends approximately parallel to the longitudinal axis ofsaid cone-shaped body and having an annular extreme outer marginalportion that joins said shoulder and that extends in a planeapproximately normal to the longitudinal axis of said cone-shaped body,said annular extreme outer marginal portion of said cone-shaped bodyhaving engagement upon said outer marginal flat portion of said basketand having centering engagement within said adjoining outer edge portionof said basket, and means for securing said annular outer marginalportion of said cone-shaped body in position upon said outer marginalflat portion of said basket, the depth of said annular shoulder of saidcone-shaped body being greater than that of said ribs so that only saidannular extreme outer marginal portion of said cone-shaped body hassupporting engagement upon the outer marginal annular flat portion ofsaid basket, whereby said ribs and shoulder are free for vibratoryaction.

2. The same structure as recited in claim 1 hereof and in which saidannular shoulder is slightly inclined inwardly and forwardly so as tothereby still further increase the flexibility of said cone-shaped bodywhen in assembly.

References Cited in the file of this patent UNITED STATES PATENTS2,502,853 Keddie Apr. 4, 1950 2,638,509 Charlesworth May 12, 1953FOREIGN PATENTS 443,816 Great Britain Mar. 6, 1936

